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Round-robin tournament. A round-robin tournament or all-play-all tournament is a competition format in which each contestant meets every other participant, usually in turn. [1][2] A round-robin contrasts with an elimination tournament, wherein participants are eliminated after a certain number of wins or losses.
In a round-robin tournament, all playoff contenders play each other an equal number of times, usually once or twice (the latter is often called a "double round robin"). This is a common tournament format in association football. In the FIFA World Cup, teams are organized into eight pools of four teams, with each team playing the other three ...
Double-elimination tournament. A double-elimination tournament is a type of elimination tournament competition in which a participant ceases to be eligible to win the tournament 's championship upon having lost two games or matches. It stands in contrast to a single-elimination tournament, in which only one defeat results in elimination.
Swiss-system tournament. A Swiss-system tournament is a non-eliminating tournament format that features a fixed number of rounds of competition, but considerably fewer than for a round-robin tournament; thus each competitor (team or individual) does not play all the other competitors. Competitors meet one-on-one in each round and are paired ...
The change was intended to allow the expansion of the main stage of the tournament from twelve to sixteen teams while keeping the round robin at eleven games. The teams are seeded using a ranking system in which points are calculated based on the teams' results in all competitive bonspiels using a complicated formula. Seeds 1, 4, 5, 8, 9, 12 ...
The Sonneborn–Berger score is the most popular tiebreaker method used in Round Robin tournaments.However in contrast to Swiss tournaments, where such tiebreaker scores indicate who had the stronger opponents according to final rankings, in Round Robin all players have the same opponents, so the logic is a lot less clear-cut.
Round robin is a procedure for fair item allocation. It can be used to allocate several indivisible items among several people, such that the allocation is "almost" envy-free: each agent believes that the bundle they received is at least as good as the bundle of any other agent, when at most one item is removed from the other bundle. In sports ...
In a group tournament, unlike a knockout tournament, there is no scheduled decisive final match. Instead, all the competitors are ranked by examining the results of all the matches played in the tournament. Typically, points are awarded for each match, [n 1] with competitors ranked based either on total number of points or average points per match.